NDLI: Experimental evaluation of throughput performance in broadband packet wireless access based on VSF-OFCDM and VSF-CDMA

Content Provider	IEEE Xplore Digital Library
Author	Maeda, N. Kishiyama, Y. Higuchi, K. Atarashi, H. Sawahashi, M.
Copyright Year	2003
Description	Author affiliation: Wireless Labs., NTT DoCoMo Inc., Kanagawa, Japan (Maeda, N.; Kishiyama, Y.; Higuchi, K.; Atarashi, H.; Sawahashi, M.)
Abstract	We recently proposed broadband packet wireless access based on variable spreading factor (VSF)-orthogonal frequency and code division multiplexing (OFCDM) in the forward link and variable spreading and chip repetition factors (VSCRF)-CDMA in the reverse link for the systems beyond IMT-2000. This paper presents experimental evaluations on the throughput performance of that proposed broadband packet wireless access scheme associated with adaptive modulation and channel coding (AMC) in a multipath Rayleigh fading channel employing the implemented base station (BS) and mobile station (MS) transceivers. The implemented OFCDM transceiver verifies the effectiveness of the combination of the OFCDM and AMC including QPSK and 16QAM data modulations with a fast round trip delay of 6 msec for improving the throughput performance by exploiting the frequency diversity effect in a broadband channel. The experimental results show that the throughput performance of 100 and 200 Mbps employing AMC is achieved at the average received signal energy per symbol-to-background noise power spectrum density ratio (E/sub s//N/sub 0/) of approximately 7.5 and 19 dB, respectively, for 15-code multiplexing for the spreading factor of SF=16 in the OFCDM forward link with a 100-MHz bandwidth, in a six-path fading channel with the fading maximum Doppler frequency of f/sub D/=20 Hz. Furthermore, we elucidate that the peak throughput of 20 Mbps is achieved at the average received E/sub s//N/sub 0/of approximately 9 dB by employing QPSK data modulation with R = 1/2 for three-code multiplexing for SF= 4 in a four-path fading channel in the broadband CDMA reverse link with a 40-MHz bandwidth.
Sponsorship	IEEE Commun. Soc
Starting Page	6
Ending Page	11
File Size	786791
Page Count	6
File Format	PDF
ISBN	0780378229
DOI	10.1109/PIMRC.2003.1264221
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-07
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Throughput OFDM Fading Frequency Transceivers Quadrature phase shift keying Bandwidth Code division multiplexing Modulation coding Channel coding
Content Type	Text
Resource Type	Article

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